Mold for centrifugal pipe casting



3 Sheets-Sheet l J. H. U'HRIG Filed Nov. 6, 1925 Dec. 4, 1928.

MOLD FOR CENTRIFUGAL PIPE CASTING Dec. 4, 1928. LGQSUE A J. H. UHRIG MOLD FOR CENTRIFUGAL PIPE CASTING Filed Nov.6; 1926 5 Sheets-Shea?l 2 J. H. UHRIG MOLD FOR CENTRIFUGAL PIPE CASTING Dec. 4, 192s. y 11,693,703

Filed Noia, 192e :s sheets-sheet 5 PatentedV Dec. 4, 1928.

UiTr-:D- s'TArEs JOHN 'UHRIG3 0F BEVERLY, NEW JERSEY, ASSIGNOR T0 'UNITED STATES CST N PIPE & FOUNDRY COMPANY,

' NEW JERSEY;

OF BURLINGTON, NEW JERSEY, A. CORPORATION OF FIOLD FOR CENTRIFUGAL PIPE CASTING.

`J Applicationl led November 6, 1926. Serial No. 146,612.- y

My invention relates to the construction of metallic molds for the centrifugal casting of pipe by what is generally known. a's the De Lavaud process. As heretofore generally constructed the metal mold, usually made from a steel forging, has been formed'with radial ianges at its ends, to one of which, in practice, that at the bell end of the mold, the driving mechanism is connected, while to the flange at the opposite end is connected a cylindrical drum in which is formed circumferential packing grooves. Owing to the rapid heating and cooling of molds used in centrifugal pipe casting destructive strains are set up in the metal of the mold, which sooner or later lead to the formation of checks and cracks which impair its usefulness and this tendency of the mold to 'check or crack un'der the conditions of use I have discovered to be due to a quite large extent to the presence of the integral radial flanges at the ends of the mold and which flanges not being exposed to the same rapid alternations of temperature as the body of the mold bring about injurious strains.

The object -of my invention is to provide a mold, the useful life of which will be materially increased and this increased durability I have discovered can be attained by forming the metallic mold with an external conformation substantially corresponding to its internal conformation and without substantially extending radial flanges at its ends and the leading feature of my invention convention further consists in securing to one end of the mold formed as above described, preferably to its bell end, a 'separable radially extending flange to which the mold driving mechanism is or can be attached and through which the mold is driven and by preference l form integral with such a separable flange a core receiving set.d A further feature of my invention consists in forming in the unlianged spigot end of the mold one or more packing receiving circumferential grooves.

The nature ofemy invention will be-best understood as described in connection with the drawings in which it is illustrated, and in which .the mold which lies in front of the section si'sts in the provision of such a mold. My in- 4 Figure 1 is a sectional elevation of my im proved mold an'd the casing in which it is assembled for use, taken as on the line 1-1 of Fig. 2 but with one of the roller supports for shown in section.

Figure 2 is an end view of theapparatus shown in Fig. 1, viewed from the bell end of the mold. p' v Figure 3 a cross section on the line 3 3 of Fig. 1, and

Figure 4 an end view of the spigot end of the mold.

Figure'5 isa sectional elevation of a modied construction showing modified means for securing separable flanges to both ends of the mold, and

Figure 6 is a sectional elevation of the bell end of a mold showing a further modication of means for securing the separable parts to the mold end. l f

Referring first to the construction of Figs. 1 to 4:

A indicates the body of the mold; A1 its bell end, having as shown, a shouldered butt end A2. As indicates the spigot end of the mold, formed withV circumferential packing receiving grooves indicates at a3. B and B1 are respectively the lower and upper sections of the casing enclosing the mold and servin as a water jacket surrounding the mold. C, are supporting rolls on which the mold rests in the casing. D, D1, are heads formed at the end of the casing through which the spigot end of the mold projects and against which packing rings, indicated at d and d1, and lying in the peripheral grooves as, form water tight joints. E is a terminal ring secured to the spigot end of the mold as shown by a split ring F engaged in the peripheral groove A4 of themol'd. G indicates the end wall of the casing locate'd near the bell end of the mold. H is a driving gear ring on which H1 indicates the gear teeth,.which ring, as shown, is formed integral with a separable flange z', tting over the butt end A2 at the bell end of -the mold, as indicated at 1 and having a shoulder '2 which fits against theV inside of the shoulder A2. At the inner end of the ring H, I have indicated a separable ne@ flange section is formed With an annular shoulder I3 fitting inan annular seat in the shoulder z'. rlhe core seat portion is formed with key slots indicated at I4 While the flange portion is, as shown, provided with bolt holes f I5 through Which extend bolts K screiving into the flange section if In the particular form of my invention, as illustrated and above described, the place of the customary integral iange at the bell end of the mold is taken b-y the two flanged parts I' and z', which constitute together a divisional radial ange but it Will be understood that the essential feature of my invention consists in provi-ding in place of theintegral fiange a separable flange through which, and convenient attachments, the mold can be ro- A tated and which being entirely separate from the mold proper permits the rapid expansion and contraction of the mold Without subjecting it to the same strains which I have found to exist Where the dange is an 'integral part 'of the mold.

In the modification shown in Fig. 5, the spigot end A3 of the moldis threaded as shown at a and the butt end of the bell is also threaded as shown at a2. A Harige ,fi, is secured on the' spigot end and formed with a ring or drum extension 71,711, to which is keyed a driving pulley ILH, and which is formed with grooves to receive packing rings ,dl, tting against the end walls DJD and D,D1. At the hellend of the mold a separable pant formin a flange LI, and core seat I,I2, is secured on the end of the mold with a shoulder I,I1 abutting against the end. The flangev I,I is grooved to receive packing rings Z5,

' vvhich fit against the end Walls G,Gr of the cas- In Fig. 6 a Hange z',z',, is keyed to the butt en'd A2 of the mold and formed with a threaded. extension ,z'fl into which screws a ring I,I,I, Which forms acore seat I,I,I2, and has ai shoulder I,I,I1, which lits against the end of the mold and coa/ets with shoulder ,z'a? on' fiange i,z',, in securing the composite fiange to the end of the mold. A set screw L serves to secure the parts z',,' and I,I,I'togeth er. A

ring or drum extension H,H,H, supports any driving mechanismnot shown.

It will be understood that the essential features of my invention consist in providing an uniianged mold and separable means for making the usual attachments at-the' ends of Losanna the mold. The specific forms shown may be taken as illustrative and not, except Where specifically called for in the claims, as essential features of my invention.

By -dispensing with the generally used flange at the spigot end of the mold, as in Fig. 1, I avoid strains due to rapid expansion and contraction at this'end of the mold and by providing the packing grooves in the cylindrical body of the mold I am enabled to secure a Water tight joint in asimple and eificient manner andv Without the employment of the flange and drum heretofore generally used at this end-of the mold.

Having now described my invention, What i I claim as new and desire to secure by Letters Patent is:

1. A bell ended metal mold for'centrifugal casting of' pipe, the external conformation of the bell end substantially corresponding to its internal conformation inl combinationwith a separable part comprising a radial Hange and core seat and means for attaching said separable part to thebell end of the mold.-

2. A metal mold for the centrifugal casting of pipe having the internal conformation of the exterior of the pipe to be formed init,

said mold having an uniianged spigot end radial flange and means for attaching said i flange to the bell qend of the mold.

4. A metal mold'for the centrifugal casting les l of pipe, formed Without substantial radial flanges at its ends in combination with a separable radial iange for the attachment of drivingmeans and means for securing said flange to one end of the mold. Y v

5.l A'metal mold for the centrifugal casting of pipe, formed withoutsubstantial radial flanges at its ends in combination with a separable radial flange for the attachment of driving means, a driving gear-'ring atv tached to said Hangs, and means for securing said flange to one end of the mold.'

6. A Ametal mold for the centrifugal' caste l ing of pipe, formed without substantial radial flanges at its ends in combination with a driving ring and means for attaching said ring to' an untlanged end of the mold.v

7 A pipe mold consisting of a tubular shell of uniform thickness throughout its length, removable end rings therefor, and means to secure said rings inv placeon said shell.

8. A pipe mold tube the wall of which is of substantially uniform thickness throughout mames E its entire length, and a. driving ring removmold is revolvably supported with its ends ably secured around the exit .end of said extending beyond the water jacket, a. sepamold tube. -rable radlal flange attached to one end of the 1o 9. A machine for the centrifugal castin mold and means for rotating the mold oper- 5 of pipes, comprisnga metal mold forme atively connected therewith through said without substantial radial flanges at its ends, separable Bange.

a casing forming a water jacket in which the JOHN H. IG; 

